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NetSurveyor-Pro Screenshots
Below are sample screenshots from NetSurveyor-Pro. They are divided into two categories: Performance Analysis and 802.11 Network Discovery.
Performance Analysis (802.11 Adapters and Connections)
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Adapter Statistics Grid Description: Most of the columns in this grid are self-explanatory -- though the 'Current', 'Average', 'High' and 'Low' columns require additional explanation. The percentages reported for those columns are relative to the real-world maximum which, by default, is set to 23.8 Mbps. So, a result of 50% means 50% of 23.8 Mbps, or 11.9 Mbps. NetSurveyor-Pro repeatedly measures the performance of each adapter connection and reports that as a percentage relative to the real-world maximum. 'Current' refers to the most recent measurement; 'Average' is the average of all measurements for that adapter since the application was launched; 'High' is the largest value for that adapter since the application was launched; and 'Low' is the lowest value since the application was launched. 'Std. Dev.' is the standard deviation of the performance measurements for that adapter since the application was launched and reflects the degree to which measurements vary from the average. |
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Adapter
Heatmap
Chart Description: Also known as a "waterfall" graph. This chart is a 3-dimensional representation of the data, where each adapter is listed along the X-axis, the Y-axis is a time scale and indicates the last 60 scans or sweeps, and the "Z-axis" is the color scale. Each horizontal line in the Heatmap chart displays the % real-world maximum performance (as a color) for each adapter measured over the time period of one scan. That is, with each scan or sweep a new row is added at the bottom of the Heatmap chart and it continues to scroll upward. The color legend to the right shows that larger values for % real-world maximum will appear red and smaller values will appear blue or black. Ten colors are used to represent the ranges 0-10%, 11-20%, 21-30%, 31-40%, and so on. |
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Adapter Timecourses Chart
Description: This chart is useful for monitoring adapters as a function of time. Each adapter is represented by a different line -- the x-axis is time and the y-axis is Throughput (in Mbps). As an aid to viewing the behavior of a specific adapter simply select (i.e. highlight) the row corresponding to that adapter in the grid above and then its timecourse will be highlighted. In the example below we selected the adapter #1 and now we can clearly monitor its particular timecourse. |
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Adapter Spectrogram Chart Description: Shows a similar result as the Adapter Timecourses chart, but in 3-dimensions. The Adapter Spectrogram view is a 3D plot of the 802.11 adapters as a function of time. Each adapter is represented by its own set of bar graphs -- the Z-axis is time and the Y-axis is Throughput (in Mbps). |
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Adapter Statistics
Chart (Average, Std. Deviation) Description: Shows an averaged Throughput value (in Mbps) for each adapter since the application was first launched (the horizontal red bar), along with its associated standard deviation. The standard deviation reflects the degree to which measurements deviate from the average. A smaller standard deviation is a good sign since it indicates that performance measurements have been relatively consistent and stable. A larger standard deviation indicates variation in the measurements and may be a reflection of the throughput reliability of that particular adapter. |
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Connection Breaks Chart Description: This is an interesting chart -- it tracks the number of failed ICMP or "ping" messages exchanged between an adapter and the access point it is associated with. These connection "breaks" or "drops" could be due to a variety of causes -- e.g. RF or multipath interference, weak and/or unreliable signals, collision with other 802.11 devices in the area, an overburdened adapter or access point, a malfunctioning adapter or access point. Also, if the adapter is not associated with an access point or dissociates while the application is running then the number of connection breaks will increment by one with each scan or sweep. In contrast with a performance metric, connection "breaks" or "drops" can be viewed as a reliability metric. |
802.11 Network Discovery
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Grid of Access
Points Description: This grid of local access points is updated in (semi) realtime -- that is, scans are performed approximately once every 5 seconds. |
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Timecourse of
Beacon Qualities For Each Access Point Description: This chart displays the beacon strength of each access point as a function of time. The Y-axis reports the signal strength as a signal quality (0 - 100%) -- where a maximum signal is assumed to be -20 dBm and the dissociation signal is -85 dBm (http://www.ces.clemson.edu/linux/dbm-rssi.shtml). |
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Differential
Display of Beacon Qualities For Each Access Point Description: This chart displays the current beacon strength of each access point compared with an earlier snapshot. The current beacon strength is displayed in purple, the snapshot in light-blue, and the difference in olive green. |
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Usage of Each
of the 802.11 b/g Channels Description: This chart combines the access points by channel and displays a summary of channel usage. As in most of the other charts, the Y-axis reports the signal strength of beacons as a signal quality (0 - 100%). In this view the data for each channel represents a collection of access points -- hence the signal quality as displayed along the Y-axis is often greater than 100%. This is because we are summing the signal qualities for each of the access points that use a particular channel. |
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Timecourse of
the Usage of Each of the 802.11 b/g Channels Description: This chart combines the access points by channel and displays a summary of channel usage as a function of time. As in most of the other charts, the Y-axis reports the signal strength of beacons as a signal quality (0 - 100%). In this view the data for each channel represents a collection of access points -- hence the signal quality as displayed along the Y-axis is often greater than 100%. This is because we are summing the signal qualities for each of the access points that use a particular channel. |
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Heatmap Chart
of the 802.11 b/g Channels Description: This chart combines the access points by channel and displays a summary of channel usage as a Heatmap. The Heatmap chart is also known as a "waterfall" graph. It is a 3-dimensional representation of the data, where the X-axis is the channel, the Y-axis is a time scale, and the "Z-axis" is the beacon signal quality that uses color scale. Each horizontal line in the Heatmap chart displays beacon signal strength (as a color) as a function of channel as measured over the time period of one scan. That is, with each scan (or sweep) a new row is added at the bottom of the Heatmap chart. The color legend to the right shows that stronger signals will appear red and weaker signals will appear blue. |
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Channel
Spectrogram of the 802.11 b/g Channels Description: The Channel Spectrogram chart is a 3D view of channel usage as a function of time. Each channel is represented by its own set of bar graphs -- the X-axis is the channel, the Z-axis is a time scale, and the Y-axis reports the signal strength of beacons as a signal quality (0 - 100%). In this view the data for each channel represents a collection of access points -- hence the signal quality as displayed along the Y-axis is often greater than 100%. This is because we are summing the signal qualities for each of the access points that use a particular channel. |
